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Information × Registration Number 0211U013100, 0111U008517 , R & D reports Title Glazed ceramics from eastern-southern Crimea in the system of ceramic production in Medieval Black Sea region popup.stage_title Head Bocharov Sergej G., Registration Date 23-12-2011 Organization Crimean Branch of Institute of Archaeology National Ukrainian Acadamy of Sciences popup.description2 In 2011 all complex of a necessary spade works for project performance has been done - studying of archival materials, acquaintance with really existed funds of museums and of archaeological expeditions, storing (constantly or temporarily) interesting samples of glazed medieval ceramics; selection, the scientific description and photo of the samples, intended for the further analytical research. The program of analytical researches has been started. According to this program, in 2011 there has been begun carrying out of series of microscopic X-ray fluorescence analysis of glazes and the petrographic analysis of forming weights (crocks). From the series started in manufacture results of the analysis of 56 samples are receive, expert estimation of these results allows to draw preliminary conclusions. The analyzed samples belonged to the class of high-leaded glazes, that consist of 2 groups on concentration of lead oxide, and samples with rather smaller concentration of lead oxide (with factor Q=PbO/SiO2 in the range from 1,0 to 2,0) numerically prevail. The smaller group is made glazes with the highest concentration of lead oxide (with factor Q> 2,0). Dyes of lead glazes of East Crimean ceramics were copper oxide (for reception of green color) and iron (for achievement of brown or yellow color, depending on its concentration). The pale-yellowish or pale-greenish shade of glaze (on unpainted sites) is the result of high-leaded composition of glaze, i.e. concentration of lead oxide, influenced on glaze color. Other criteria for division of investigated group both on chronology, and on quality of used raw materials are supposed also. However differences between the separate produced centers in East Crimean group (the cities of Kaffa, Soldajja, Solhat - present Feodosiya, Sudak, Stari Krim) it was not possible while to reveal. Probably, they will be shown after reception of results of the analysis of all series of the samples started in manufacture. Product Description popup.authors popup.nrat_date 2020-04-02 Close